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regenerate-unicode-identifier-parts.js

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const MAX_UNICODE_CODEPOINT = 0x10FFFF;

const isStart = c => /[\p{ID_Start}\u{2118}\u{212E}\u{309B}\u{309C}]/u.test(c); // Other_ID_Start explicitly included for back compat - see http://www.unicode.org/reports/tr31/#Introduction

const isPart = c => /[\p{ID_Continue}\u{00B7}\u{0387}\u{19DA}\u{1369}\u{136A}\u{136B}\u{136C}\u{136D}\u{136E}\u{136F}\u{1370}\u{1371}]/u.test(c) || isStart(c); // Likewise for Other_ID_Continue

const parts = [];

let partsActive = false;

let startsActive = false;

const starts = [];

for (let i = 0; i < MAX_UNICODE_CODEPOINT; i++) {

if (isStart(String.fromCodePoint(i)) !== startsActive) {

starts.push(i - +startsActive);

startsActive = !startsActive;

}

if (isPart(String.fromCodePoint(i)) !== partsActive) {

parts.push(i - +partsActive);

partsActive = !partsActive;

}

console.log(`/**

* Generated by scripts/regenerate-unicode-identifier-parts.js on node ${process.version} with unicode ${process.versions.unicode}

* based on http://www.unicode.org/reports/tr31/ and https://www.ecma-international.org/ecma-262/6.0/#sec-names-and-keywords

* unicodeESNextIdentifierStart corresponds to the ID_Start and Other_ID_Start property, and

* unicodeESNextIdentifierPart corresponds to ID_Continue, Other_ID_Continue, plus ID_Start and Other_ID_Start

*/`);

console.log(`const unicodeESNextIdentifierStart = [${starts.join(", ")}];`);

console.log(`const unicodeESNextIdentifierPart = [${parts.join(", ")}];`);